Selected MCQ

Current Question
In a Fermi gas at absolute zero, particles occupy:
  • A. Random energy levels
  • B. Only highest energy level
  • C. All states up to Fermi energy
  • D. Only ground state
Correct Answer: C
Explanation:
Fermions fill all states up to the Fermi level due to Pauli exclusion.
Related Question 1
The entropy at absolute zero for perfect crystal is:
  • A. Maximum
  • B. Infinite
  • C. Zero
  • D. Undefined
Correct Answer: C
Explanation:
Third law states entropy approaches zero.
Related Question 2
Which principle states that identical fermions cannot occupy the same quantum state?
  • A. Heisenberg principle
  • B. Pauli exclusion principle
  • C. Hund’s rule
  • D. Aufbau principle
Correct Answer: B
Explanation:
Fermions obey antisymmetric wavefunctions prohibiting identical states.
Related Question 3
Which force acts on charged particles?
  • A. Gravitational
  • B. Magnetic
  • C. Electric
  • D. Nuclear
Correct Answer: C
Explanation:
Electric force acts on charges.
Related Question 4
Which principle states particles are indistinguishable?
  • A. Pauli principle
  • B. Superposition principle
  • C. Indistinguishability principle
  • D. Correspondence principle
Correct Answer: C
Explanation:
Quantum particles of same type are identical.
Related Question 5
In quantum electrodynamics, the interaction between charged particles is mediated by:
  • A. Gluons
  • B. Photons
  • C. Gravitons
  • D. W bosons
Correct Answer: B
Explanation:
Electromagnetic interactions occur via exchange of virtual photons.